.bg{
    width: 1200px;
    height: 627px;
    margin: 0 auto;
    background: url(../img/bg.png);
}
.nav{
    background: url(../img/logo.png) no-repeat left center;
    width: 850px;
    height: 50px;
    margin: 0 auto;
    padding: 50px 0 0 150px;
}
.nav span{
    padding: 0 30px; 
    color: #666666;  

}
.search{
   float: right;
   width: 200px;
   height: 30px;
   color: #ffffff;
   font-size: 14px;
   line-height: 30px;
   border-radius: 100px;
   background:#ffffff url(../img/f.png) no-repeat left center;
}
.yzy{
    width: 1200px;
    height: 455px;
    background:url(../img/dongtai.jpg)no-repeat center top ;
}
.remai{
    float: left;
}